Legals have said best let slide in favour of getting an agreement (and therefore getting out with some remaining sanity) without the vast extra costs of a final hearing. Difficult to know if somebody is being full and frank in their disclosures, particularly when you have see tendencies to omit some information, inflate 'needs', and various other dishonest tactics involving financial values to suit their argument. Not dealing with a rational, honest, individual - and their sharks might be worse but it's difficult to tell whose character is worst at this point.
> SM can be varied in future by application to the court.
The question remains of how to know when to do that. It would probably be the same question if somebody suspected multiple employments but only saw one P60 - private investigators seems the only route.